[bug #58206] [PATCH] fix PDFPIC issue with determining size of pdfs containing images

[Dave]

Follow-up Comment #10, bug #58206 (project groff):

Addressing bug #55107 will obviate the need for this particular shell pipeline
at all (though tmac/pdfpic.tmac contains several other .sy calls which may
still persist).  But that's a more substantial change, and the patch proposed
in comment #4 here is simple and low-risk, so it's something that could be
done until 55107 is addressed.

The mailing list recently discussed alternative fixes to this pipeline,
including replacing the problematic grep with an awk
(http://lists.gnu.org/archive/html/groff/2021-09/msg00061.html) or sed command
(http://lists.gnu.org/archive/html/groff/2021-09/msg00062.html).  But the
comment #4 patch looks to me like the simplest and most portable fix.

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